This piece of article is filled with misinformation. Indian calender system called "panchang" incorporated the motion of earth, sun, moon and stars long before the dates mentioned in this article[1]. Various Sanskrit Astronomy treatise calculated and continuously refined the calculation.
> Dharmic (Hindu) scholars kept precise time by observing and calculating the cycles of Surya i.e. the sun, moon and the planets. These calculations about the sun appear in various astronomical texts in Sanskrit, such as the 5th-century Aryabhatiya by Aryabhata, the 6th-century Romaka by Latadeva and Panca Siddhantika by Varahamihira, the 7th-century Khandakhadyaka by Brahmagupta and the 8th-century Sisyadhivrddida by Lalla.[24] These texts present Surya and various planets and estimate the characteristics of the respective planetary motion.[24] Other texts such as Surya Siddhanta dated to have been completed sometime between the 5th century and 10th century present their chapters on various deified planets with stories behind them.
Hindu India have names for time scale ranging from 10e-17 to 10e22 long before Greece and Arabia[2].
I really don’t understand the ethnocentric zero-sum perspectives from some people responding in this thread. People seem to forget that knowledge is cumulative. While there is no doubt that plenty of knowledge predates the Arabic philosopher-scientists, and surely they inherited traditions from those who came before them, but it is also clear that they added to the universal body of knowledge. To pretend otherwise or to downplay those accomplishments in order to raise up others, is (to my mind) profoundly sad and anti-scientific. If we are giants, it’s because we stand on the shoulders of giants. And to paraphrase Terry Pratchet, it’s giants all the way down.
> Dharmic (Hindu) scholars kept precise time by observing and calculating the cycles of Surya i.e. the sun, moon and the planets. These calculations about the sun appear in various astronomical texts in Sanskrit, such as the 5th-century Aryabhatiya by Aryabhata, the 6th-century Romaka by Latadeva and Panca Siddhantika by Varahamihira, the 7th-century Khandakhadyaka by Brahmagupta and the 8th-century Sisyadhivrddida by Lalla.[24] These texts present Surya and various planets and estimate the characteristics of the respective planetary motion.[24] Other texts such as Surya Siddhanta dated to have been completed sometime between the 5th century and 10th century present their chapters on various deified planets with stories behind them.
Hindu India have names for time scale ranging from 10e-17 to 10e22 long before Greece and Arabia[2].
[1] https://en.wikipedia.org/wiki/Hindu_calendar#Texts
[2] https://en.wikipedia.org/wiki/Hindu_units_of_time